import React, {Component} from 'react';
import './index.css'

export default class Item extends Component {

    state = {mouse:false}

    //鼠标移入移出
    handleMouse=(flag)=>{
        return ()=>{
            this.setState({mouse:flag})
        }
    }

    //勾选、取消按钮的回调
    handleCheck=(id)=>{
        return (event)=>{
            this.props.changeTodo(id,event.target.checked)
        }
    }

    //删除一个todo的回调
    handleDelete=(id)=>{
        if (window.confirm('你确定删除吗？')){
            this.props.deleteTodo(id);
        }
    }

    render() {
        const {id,name,done} = this.props;
        const {mouse} = this.state
        return (
            <li style={{backgroundColor:mouse ? '#ddd':'white'}} onMouseEnter={this.handleMouse(true)} onMouseLeave={this.handleMouse(false)} >
                <label>
                    <input type="checkbox" checked={done} onChange={this.handleCheck(id)}/>
                    <span>{name}</span>
                </label>
                <button onClick={()=>this.handleDelete(id)} className="btn btn-danger" style={{display: mouse ? 'block':'none'}}>删除</button>
            </li>
        );
    }
}
